Add warning to earlier fast path

Author: 1-Bart-1

src/wing_geometry.jl

@@ -728,6 +728,13 @@ function refine!(wing::AbstractWing; recompute_mapping=true, sort_sections=true)
     if length(wing.refined_sections) == 0
         if wing.spanwise_distribution == UNCHANGED ||
                length(wing.unrefined_sections) == n_sections
+            if wing.spanwise_distribution == BILLOWING &&
+                    wing.billowing_percentage > 0
+                @warn "Billowing requested but n_panels " *
+                    "($(wing.n_panels)) == n_provided; no " *
+                    "intermediate sections to billow. " *
+                    "Increase n_panels."
+            end
             wing.refined_sections = copy(wing.unrefined_sections)
             recompute_mapping && compute_refined_panel_mapping!(wing)
             update_non_deformed_sections!(wing)
@@ -771,6 +778,9 @@ function refine!(wing::AbstractWing; recompute_mapping=true, sort_sections=true)
                 reinit!(wing.refined_sections[i], wing.unrefined_sections[i])
             end
         end
+        if wing.spanwise_distribution == BILLOWING && wing.billowing_percentage > 0
+            @warn "Billowing requested but n_panels ($(wing.n_panels)) == n_provided; no intermediate sections to billow. Increase n_panels."
+        end
         recompute_mapping && compute_refined_panel_mapping!(wing)
         update_non_deformed_sections!(wing)
         return nothing
@@ -1145,11 +1155,6 @@ function refine_mesh_by_splitting_provided_sections!(
                 reinit!(refined_section, section)
             end
         end
-        if billowing_percentage > 0
-            @warn "Billowing requested but n_panels == n_provided " *
-                "($n_panels_desired); no intermediate sections to " *
-                "billow. Increase n_panels to add sections between ribs."
-        end
         return nothing
     end
 

test/wing_geometry/test_billowing.jl

@@ -1,4 +1,5 @@
 using Test
+using Logging
 using LinearAlgebra
 using VortexStepMethod
 using VortexStepMethod: Wing, Section, add_section!, refine!
@@ -240,7 +241,7 @@ end
                 [-1.0, y, 0.0],
                 INVISCID)
         end
-        @test_logs (:warn, r"no intermediate sections") refine!(wing)
+        @test_logs (:warn, r"no intermediate sections") min_level=Logging.Warn refine!(wing)
 
         # All refined sections should match unrefined exactly
         for (ref, unref) in zip(